Latest version before upgrade to underpinning VECtorsToolkit

Due to overcomplicated class structure, the code will be refactored with a simplified architecture.

The vector field will be nothing but a numpy array with certain dimension, and not anymore a class.

The underpinning library to deal with vector fields is external and will be stored in VECtorsToolkit.

This release represent the tag before this architecture upgrade, and it is meant to reproduce the results as proposed in the WBIR paper.

The next version, with its more flexible structure, is the suggested starting point for future research.